​Featuring a 3 zoned coil design, this mattress offers pressure relief and support where you need it, with a cool twist® gel memory foam that contours to your body—with upgrades available for even more cooling and comfort. Coolfeel™ fabric - a luxurious, breathable cover with a cool-to-the-touch sensation from technology that is plant-derived. Our biobased phase change material consists of 53% biobased content and is certified through the usda biopreferred® program. Antimicrobial mattress protection - keeps your mattress fresh and clean from odor causing bacteria. This product protects the mattress but does not protect users against bacteria, viruses, germs or other disease organisms. Cool twist® gel memory foam - this breathable, gel-infused memory foam gently cradles your body while promoting enhanced airflow. 850 edition custom 3 zoned support coil system. This system of individually wrapped coils provides contouring, cradling support from edge-to-edge, minimizing the impact of your partner’s movements Proudly 100% usa assembled Compatible with most frames, platforms and adjustable bases We only use foam that is certipur-us CERTIFIED Mattress Top Type: Tight Top Mattress Type: Hybrid Included: 1 Mattress(es), 1 Box Spring(s) Features: Breathable, Cooling, Temperature Regulating, Antimicrobial, Foam Layer, Wrapped Coils Additional Information: Suitable for Adjustable Bed Frames, Conforms To Body Coil Count: 493 Coils Manufacturer Warranty: 10 Year Limited Bed Size: Twin Maximum Weight Limit: 1000 Lbs Base Material: 90% Metal, 10% Foam Comfort Type: Firm Mattress + Box Spring Measurements: 76 Length\Inches, 40 Width\Inches, 21 Depth\Inches Care: Spot Clean Certifications And Listings: Certipur-Us Certified Country of Origin: Made in US Visit our Furniture & Mattress Customer Care Center for delivery options, protection plans and other services. Problem with an order or need help with a return? Our Furniture & Mattress Customer Service agents will be happy to help. Give us a call at 1-800-442-7902 Don’t forget to print off your delivery checklist to avoid any delays or issues when delivering your item. Set includes mattress plus box spring\foundation. King and Cal. King mattress sets feature 2-piece side-by-side foundations for easier navigation in tight spaces. Serta Perfect Sleeper Dazzling Night 12" Hybrid Firm - Mattress + Box Spring